Pipeline_Impl was modified to properly render a stream that has video but no ...

media/base/filter_host_impl.h

 // Copyright (c) 2006-2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Implementation of FilterHost.
 
 #ifndef MEDIA_BASE_FILTER_HOST_IMPL_H_
 #define MEDIA_BASE_FILTER_HOST_IMPL_H_
 
 #include "base/task.h"
@@ skipping 29 matching lines @@
   FilterHostImpl(PipelineThread* pipeline_thread, Filter* filter)
       : pipeline_thread_(pipeline_thread),
         filter_type_(Filter::filter_type()),
         filter_(filter),
         scheduled_time_update_task_(NULL),
         stopped_(false) {
   }
   ~FilterHostImpl() {}
 
   // If this FilterHost contains a filter of the specifed Filter class, then
-  // this method returns a pointer to the interface, otherwise it returns NULL.
+  // this method returns a pointer to the interface, otherwise it returns NULL
+  // in |*filter_out|.
   template <class Filter>
-  Filter* GetFilter() const {
-    Filter* filter = NULL;
-    if (Filter::filter_type() == filter_type_) {
-      filter = reinterpret_cast<Filter*>(media_filter());
-    }
-    return filter;
+  void GetFilter(scoped_refptr<Filter>* filter_out) const {
+    *filter_out = (Filter::filter_type() == filter_type_) ?
+                      reinterpret_cast<Filter*>(media_filter()) : NULL;
   }
 
   // Call the filter if it has registered a time update callback if the filter
   // has registered one though the FilterHost::SetTimeUpdateCallback method.
   void RunTimeUpdateCallback(base::TimeDelta time);
 
   // Stops the filter.
   void Stop();
 
   // Used by the PipelineThread to call Seek and SetRate methods on filters.
@@ skipping 67 matching lines @@
   // Used to avoid calling Filter's Stop method multiplie times.  It is also
   // used to prevent a filter that has been stopped from calling PostTask.
   bool stopped_;
 
   DISALLOW_COPY_AND_ASSIGN(FilterHostImpl);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_FILTER_HOST_IMPL_H_